Motor for talking-machines.



E. R. JOHNSON. MOTOR FOR TALKING MACHINES.

' APPLICATION FILED NOV.1Z, 1904.

Patented Mar. 12, 1912.

' mamas 2 SHEETSSHEET 1 INVENTUB WI TNESSES ATM/MEI.

E. R. JOHNSON.

MOTOR FOR TALKING MACHINES.

APPLICATION FILED NOV. 12, 1904.

Patented Mar. 12, 1912.

2 SHEETS-SHEET 2.

WITNESSES 1/3 [H 70/? ATTORNEY.

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ELDRIDGE JOHNSON, 01F MERION, PENNSYLVANIA, ASSIGNOR T VICTOR TALKINGMACHINE COMPANY, A CORPORATION OF NEW JERSEY.

MGTOR FOR TALKING-MACHINES.

Specification of Letters Patent.

Eatented Mar. 123, 1912.

Application filed November 12, 1904. Serial No. 232.3%.

To all whom "it may concern:

Be it known that I, Enonioon R. donu- 'so1-:, 'a citizen of the UnitedStates, and a resident of Mei-ion, county of lilontgoinery,

5 State of Pennsylvania, have invented certain new and usefulImprovements in M0- tors for Talking-Machines, of which the following isa full, clear, and exact disclosure.

The object of my invention is to provide such a construction in thedrivingmechanism for talking machines that the natural vibrationsincident to a train of spur gears in a talking machine motor will bepractically overcome or reduced to a 1-5 minimum and further to reducethe parts of said mechanism to the fewest possible number, and that itwill be simple, and economical to manufacture, and will be mostefiicient for the purpose for which they are designed. Heretofore in themanufacture of motors for talking machines, it has usually beencustomary to connect the source of power, or springs, with the turntableby means of a train of spur gearing, often in eluding bevel gearssometimes including in the train of gearing a worm and also to connectthe centrifugal governor with the turntable shaft, or spindle, by meansof auxf il'iary spur gears. 'It is well knownthat in the operation of atalking machine any vibrations of the parts of the motor, which arenotcaused by the reproducer, have undesirable effects upon thereproduction of the record. The vibrations are usually due to themeshing of teeth of the ordinary train of gears, and are of suchfrequency and strength, even in a carefully constructed motor as to bequite audible. Of course, such vibrations mingle with those produced 40from the record, and, therefore, impair the quality of the selectionbeing reproduced. Even with the best of spur gears, after the same havebeen in operation for a period of time, the vibrations produced by themeshl5v ing of the gears is impossible to entirely overcome.Furthermore, in the use of a train of spur gears for talking machinemotors, vibrations are also produced, which,

although not audible to the ear as sound \iv brations, yet may be ofsuch a character as vtdcause the parts of the motor connected with theturntable to be vibrated, and so vibrate the turntable. in someinstances this movement is not visible to the eye, and

being independently inaudible such vibrations are not evident except inthe impa redi quality of the reproduction, and it has been diiiicult forpersons not familiar with the Further in some instances, as where spurgears have become worn, the teeth. of the driven gears mayintermittentlymesh and unmesh with the teeth of the driving gears with ajerky or uneven motion, which causes the-turntable to revolve at anuneven speed, which, although the difierences of speed are not visible;greatly impair the relative pitch of the successive notes or soundsreproduced from the record.

The object of my invention, therefore, as before stated, is to overcomethese objections, which I accomplish by eliminating all intermeshingspur gears and communicating the power on an inclined plane or wormmovement and at the same time so arranging the parts as to secure thedesired speed in the turn-table and governor by the use of the leastnumber of parts.

For a full, clear, and exact description of my invention, reference maybe had to the following specification and to the accompanying drawingsforming a part thereof, in which I I Figure l is a bottom plan view of atalk ing machine motor embodying my improve ments; Fig. 2 is anelevation ofthe same showing the casing for the motor in section, andFig. 3 is a detail view showing the rela-v brake disk. I

Referring to the drawings, the numeral 1 indicates the turntable, and 2the'vertical.

spindle, upon the upper. end of which the turntable 1 is mounted; saidturntable spinnal or hearing 4 carried by the support plate, orstandard, 5, of the motor. Adjacent the lower end of the turntablespindle, 2, I provide a spiral or worm 6, which is adapted to mesh witha' worm wheel or gear 7, having inclined teeth to correspond with theinclination of the threads of the worm G. The gear, 7, is preferablymounted upon, or carried by, the spring barrel or drum, 8, within whichmounted the usual spiral steel spring for furnishing the power to themotor. This spring barrel and spring are .mounted upon suitable shaft 9which carries a ratchet wheel, 10, adapted to be en- ELOJ -"pair ofsupports or hangers 15, and 17, of

different lengths, so that the axis of said spindle will be inclined asclearly indicated in Fig. 2. This inclination of the governor spindlewill cause the threads of the worm 14c, to contact with the teeth of thespur gear at such points where the threads are practically at rightangles to the plane of said spur gear. T the necessity'of making thesurfaces of the teeth of the spur gear, 13, inclined to the plane of thegear, and it also tends to provide sufficient space for the governorballs, 18, to revolve in expanded circles as the speed of the motorincreases. It is also clear that if the gear, 7 on the drum 8, were soarranged, or journaled, relatively to the worm 6 as in the governormechanism above described, a spur wheel might be used in stead of theworm gear 7. The overnor balls, 18, are carried by strips 0 springmetal, 19, the ends of which are attached to a fixed sleeve 20, and alsoto a slidable sleeve 21, to which is attached the brake disk 22.

' A spring strip 23, attached to the supporting plate, 5, of the motor,forms the support for the brake shoe, 2%, and is adjustably fixed inposition by means of a rod, 25, which has a grooved portion, 26, adaptedto be engaged by a notch, or slot, 27, in the brake'shoe'support, 23.The outer end of the rod, 25, is screw-threaded, andpasses through ascrew threaded opening in the thumb-nut, 28, said thumb nut, 28, beingrevolubly fixed in an opening in the casing 30 of the motor. When it isdesired to ad-' just the speed of the motor, the thumbnut, 28, may beturned in one direction, or the other, thereby increasing or diminishingthe pressure between the brake shoe, 24, and the brake disk 22. Theoperation of the other parts of my improved motor will be evident froman inspection of the drawing and the above description of the arts.

It will be seen that -y providing the worms and gears as abovedescribed, there is no opportunity for the teeth of the gears to slip orknock or tocreate vibration, or to become worn so as to mesh and unmeshirregularly, or inaccurately. The teeth of the spur gears comeaccurately int'o contact with the threads of the worms, and traversesuch threads with a wedging orlinclined plane his arrangement willobviate shafts upon which the worms are carried,

will be smooth, continuous, and unvariable.

In this manner the undesirable and harmful vibrations, of otherconstructions referred to, are obvlated or reduced to a minimum, and therunning of the machine effected without interfering with the soundvibration reproduced from the sound record.

Having thus described my invention, it will be obvious that changes maybe made in form, arrangement, and proportion of parts, without departingfrom the spirit and scope of my invention, but

What I claim, and desire to protect by Letters Patent, is

1. In a motor the combination with a driving shaft, means to drive thesame, a spindle, a governor and a governor shaft, and gearingbetweensaid driving shaft and said spindle and between said spindle andsaid governor shaft, all the gearing in said motor consisting of a gearwheel for the driving member of the gearing and a worm for the drivenmember of the gearing. I

, 2. In a motor the combination with a driving shaft, means to drive thesame and a gear wheel mounted on said shaft, of a spindle, a wormmounted on said spindle and meshing directly with said gear 'on saiddriving shaft and driven thereby, a gear on said spindle, a governor anda governor shaft, a worm mounted on said governor shaft and meshingdirectly with said gear on said spindle and driven thereby.

3. In a motor, the combination of a casing, a horizontal spring drivenshaft, a vertical worm gearthereon, a vertical shaft suitably journaledin said casing and provided with a worm near its lower end and a spurgear at its upper end, a governor, an inclined governor shaft journaledin brackets depending from'the top of said casing, and a worm on saidgovernor shaft meshing with said spur gear.

4. In a motor the combination with a driving shaft, means to drive thesame, a spindle, a governor and a governor shaft, and gearing betweensaid driving shaft and said spindle and between said spindle and saidgovernor shaft; the said gearing in said motor consisting of a gearwheel for the driving member of the gearing and a worm for the drivenmember. of the gear ing.

- In witness whereof, I have hereunto set my hand this 10th day ofNovember, 190i.

